Function App: Fcn Signed area hangs on calculate...

[CR Haeger]

I was checking out this thread and may have run into an issue with Fcn signed area
http://www.hpmuseum.org/forum/thread-873.html

It seems to be a special case** in Function app where:

F1(X): e^X then Plot Menu Fcn Signed area from say 0 to 5 shows 147.4 quickly, but

f(x):=e^x; Function.F1:=f; then Plot Menu Fcn Signed area from say 0 to 5 hangs at "Calculating..."

** Either method seems to work with f(x)= x, sin(x), ln(x) but hangs with e^x